Surface configuration of an airplane



FIG. 1 is a front elevational view of a surface configuration of an airplane showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front perspective view thereof; and,

FIG. 7 is a rear perspective view thereof.

The dash lines included depict environment and are not part of the claimed design. 

The ornamental design for a surface configuration of an airplane, as shown and described. 